WO2017015787A1 - Procédé et dispositif pour une surveillance de pdcch, et système de communication - Google Patents

Procédé et dispositif pour une surveillance de pdcch, et système de communication Download PDF

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Publication number
WO2017015787A1
WO2017015787A1 PCT/CN2015/085051 CN2015085051W WO2017015787A1 WO 2017015787 A1 WO2017015787 A1 WO 2017015787A1 CN 2015085051 W CN2015085051 W CN 2015085051W WO 2017015787 A1 WO2017015787 A1 WO 2017015787A1
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WIPO (PCT)
Prior art keywords
subframe
user equipment
pdcch
serving cell
downlink
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PCT/CN2015/085051
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English (en)
Chinese (zh)
Inventor
徐海博
周华
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富士通株式会社
徐海博
周华
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Application filed by 富士通株式会社, 徐海博, 周华 filed Critical 富士通株式会社
Priority to PCT/CN2015/085051 priority Critical patent/WO2017015787A1/fr
Publication of WO2017015787A1 publication Critical patent/WO2017015787A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a communication system for performing physical downlink control channel (PDCCH) monitoring.
  • PDCCH physical downlink control channel
  • the serving cell on the unlicensed frequency band can be configured as an independent serving cell to the user equipment (UE, User Equipment) for communication by the user equipment, or can be used on the unlicensed frequency band by using the serving cell aggregation method or the dual connection method in the LTE system.
  • the serving cell is configured as a secondary cell (Scell, Secondary Cell) to the user equipment, and the primary cell (Pcell, Primary Cell) is a serving cell on the licensed frequency band.
  • the working mode of the primary serving cell may be a Frequency Division Duplex (FDD) mode or a Time Division Duplex (TDD) mode; the secondary serving cell on the unlicensed frequency band may also select an FDD mode. Or one of the TDD modes, and it may be that only the downlink or the uplink and downlink are present at the same time.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the system currently uses the serving cell on the unlicensed band to communicate, for example, a Wireless Local Area Network (WLAN) system. Therefore, the addition of the LTE system must ensure that the unlicensed frequency band can be utilized fairly between the LTE system and other systems and systems of different LTE operators.
  • WLAN Wireless Local Area Network
  • LBT listen-before-talk
  • the specific implementation of LBT can be various.
  • the basic idea of LBT is that the sender must first listen for a period of time before the channel on the unlicensed band is used to transmit the signal.
  • the transmitting end can transmit a signal on the channel only if the channel is always idle during the listening period. If the channel is found to be busy during the listening period, the sender needs to automatically back off for a period of time before listening to whether the channel is available.
  • the base station may configure a cell on the unlicensed band as a secondary serving cell for a certain user equipment, and the sub-serving cell of this type is hereinafter referred to as a LAA Scell. Due to the existence of the LBT mechanism, the base station cannot guarantee that the channel can be preempted in a certain subframe of the secondary serving cell, so that the base station cannot use the high-level signaling, such as radio resource control (RRC) signaling, as the user equipment. Pre-configure an accurate frame structure of the secondary serving cell.
  • RRC radio resource control
  • the base station may configure the frame structure of the secondary serving cell to be DDDDDUUUUU for the user equipment by using RRC signaling.
  • the actual situation in a certain frame may become XXXXXXXUUU.
  • X indicates that the base station does not preempt the channel corresponding to the secondary serving cell in the subframe.
  • the base station configures the frame structure as XXXXXXDDD based on the uplink and downlink traffic conditions.
  • FIG. 1 is a diagram showing an example of dynamic determination of a frame structure of a LAA Scell in a case where a Pcell of a user equipment is configured as TDD configuration 0.
  • the subframe of the Pcell includes a downlink subframe (D), an uplink subframe (U), and a special subframe (S); the LAA Scell has a subframe that is not occupied by the base station due to the LBT mechanism, and thus cannot be configured. Precise frame structure.
  • the user equipment cannot determine the frame structure of the serving cell when determining the PDCCH-subframe to count some timers in the current DRX (Discontinuous Reception) mechanism.
  • the subframe of the frame is the frame structure of the serving cell when determining the PDCCH-subframe to count some timers in the current DRX (Discontinuous Reception) mechanism.
  • Embodiments of the present invention provide a method, an apparatus, and a communication system for performing PDCCH monitoring. Even in a system in which an unlicensed band is configured, the PDCCH subframe of the user equipment can be accurately determined, and it can be determined which subframes in the secondary serving cell of the unlicensed band are subframes for PDCCH snooping.
  • a method for performing PDCCH monitoring includes:
  • a downlink subframe of a secondary serving cell of the user equipment except the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe and the TDD system include a downlink guide
  • the union of the subframes of the DwPTS (Downlink Pilot Time Slot) is determined as the PDCCH subframe of the user equipment;
  • the user equipment In a case where the user equipment is not required by the base station to perform uplink transmission on the subframe during an active time of the user equipment, determining the subframe as a subframe for performing PDCCH monitoring; or During the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but if the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to be a PDCCH. a subframe to be monitored; or, in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, determining the subframe as a subframe for performing PDCCH monitoring;
  • the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.
  • an apparatus for performing PDCCH monitoring includes:
  • a first subframe determining unit or a downlink subframe of a secondary serving cell of the user equipment except the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe And determining, by the concatenation of the subframes that include the DwPTS in the TDD system, the PDCCH subframe of the user equipment;
  • the subframe is determined as a subframe for performing PDCCH monitoring; or, during activation of the user equipment During the period, if the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to perform PDCCH monitoring. a sub-frame; or, during the activation period of the user equipment, if the user equipment knows that the subframe is a downlink subframe, determining the subframe as a subframe for performing PDCCH snooping;
  • a monitoring unit during the activation period of the user equipment, the subframe that is determined by the first subframe determining unit and the subframe determined by the second subframe determining unit to perform PDCCH monitoring, Perform PDCCH monitoring.
  • a method for performing PDCCH monitoring includes:
  • an apparatus for performing PDCCH monitoring includes:
  • the first sending unit sends the indication information to the user equipment, so that the user equipment learns the unlicensed frequency band.
  • a subframe of the secondary serving cell is a downlink subframe; and/or,
  • the second sending unit sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.
  • a communication system comprising:
  • a user equipment a downlink subframe of a secondary serving cell other than an unlicensed frequency band and/or a serving cell configured to be a cross-carrier scheduled serving cell, or a DwPTS included in the downlink subframe and the TDD system
  • the union of the subframes is determined as a PDCCH subframe of the user equipment
  • the user equipment In the case that the user equipment is not required to perform uplink transmission on the subframe during the activation period, or during the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but In a case where the subframe is aligned or overlapped with the PDCCH subframe, or in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, the user equipment uses the subframe a subframe determined to perform PDCCH snooping;
  • the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring;
  • the base station sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe; and/or, And sending the indication information to the user equipment, so that the user equipment learns that the subframe is a downlink subframe.
  • a computer readable program wherein when the program is executed in a user equipment, the program causes a computer to perform PDCCH monitoring as described above in the user equipment method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a method of performing PDCCH monitoring as described above in a user equipment.
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to perform a method of performing PDCCH monitoring as described above in the base station.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a PDCCH monitoring as described above in a base station law.
  • An advantageous effect of the embodiment of the present invention is that, even in a system configured with an unlicensed frequency band, the PDCCH subframe of the user equipment can be accurately determined, and which subframes in the secondary serving cell of the unlicensed frequency band can be determined to perform PDCCH.
  • 1 is a diagram showing an example of dynamic determination of a frame structure of a LAA Scell in a case where a Pcell of a user equipment is configured as TDD configuration 0;
  • FIG. 2 is a schematic diagram of a method for performing PDCCH monitoring according to Embodiment 1 of the present invention
  • FIG. 3 is a diagram showing an example of determining a PDCCH subframe according to Embodiment 1 of the present invention.
  • FIG. 4 is a diagram showing an example of an uplink and downlink configuration in a transmission period according to Embodiment 1 of the present invention.
  • FIG. 5 is another exemplary diagram of an uplink and downlink configuration in a transmission period according to Embodiment 1 of the present invention.
  • FIG. 6 is another exemplary diagram of an uplink and downlink configuration in a transmission period according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic diagram of an apparatus for performing PDCCH monitoring according to Embodiment 2 of the present invention.
  • FIG. 8 is another schematic diagram of an apparatus for performing PDCCH monitoring according to Embodiment 2 of the present invention.
  • FIG. 9 is a schematic diagram of a user equipment according to Embodiment 2 of the present invention.
  • FIG. 10 is a schematic diagram of a method for performing PDCCH monitoring according to Embodiment 3 of the present invention.
  • FIG. 11 is a schematic diagram of an apparatus for performing PDCCH monitoring according to Embodiment 4 of the present invention.
  • FIG. 12 is a schematic diagram of a base station according to Embodiment 4 of the present invention.
  • Figure 13 is a diagram showing the communication system of Embodiment 5 of the present invention.
  • An embodiment of the present invention provides a method for performing PDCCH monitoring, which is applied to, for example, a primary serving cell configured with at least a licensed frequency band and a user equipment of a secondary serving cell of an unlicensed frequency band.
  • FIG. 2 is a schematic diagram of a method for performing PDCCH monitoring according to an embodiment of the present invention. As shown in FIG. 2, the method includes:
  • Step 201 The user equipment includes a downlink subframe of a secondary serving cell other than the unlicensed frequency band and/or another serving cell configured to be a cross-carrier scheduled serving cell, or the downlink subframe and the TDD system include The union of the subframes of the DwPTS is determined as the PDCCH subframe of the user equipment;
  • Step 202 For each subframe of the secondary serving cell of the unlicensed frequency band, when the user equipment is not required to perform uplink transmission on the subframe during the activation period of the user equipment, or during the activation period The user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, or the user equipment is known during an activation period.
  • the subframe is a downlink subframe, the subframe is determined as a subframe for performing PDCCH monitoring;
  • Step 203 During the activation period of the user equipment, the user equipment performs PDCCH monitoring for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.
  • the serving cell of the user equipment on the unlicensed carrier is not considered; that is, the PDCCH-subframe is defined as the unlicensed frequency band configured by the user equipment.
  • the union of the serving cell and the downlink subframes of all other serving cells outside the serving cell configured in a cross-carrier scheduling manner (for example, under the FDD system), or the downlink subframes of the other all serving cells and the TDD The system contains the union of the subframes of the DwPTS (for example under the TDD system).
  • the other serving cell may include: a primary serving cell on the licensed frequency band, and a secondary serving cell on zero or one or more licensed frequency bands; but the invention is not limited thereto.
  • the alignment or overlap between subframes is performed in the time domain, and the details will be clear to those skilled in the art. Further, it is also clear to those skilled in the art regarding the subframe including the DwPTS in the TDD system.
  • FIG. 3 is a diagram showing an example of determining a PDCCH subframe according to an embodiment of the present invention.
  • a user equipment is configured with a Pcell (configured as TDD configuration 0, its frame structure is DSUUUDSUUU), and Scell 1 (authorized frequency band).
  • Scell its frame structure is DSUUDDSUUD) and Scell 2 (LAA Scell).
  • the SPDCCH 2 is not considered when determining the PDCCH-frame, and thus the PDCCH-subframe is PPXXPPPXXP; wherein P indicates that it is a PDCCH-frame, and X indicates that it is not a PDCCH-frame.
  • LAA Scell sub-serving cell
  • whether a certain subframe is a subframe that needs to perform PDCCH monitoring may be determined as follows.
  • the user equipment may be determined to be a sub-frame for PDCCH monitoring if the user equipment is not required by the base station to perform uplink transmission on the certain subframe during an active time. frame.
  • the user equipment determines whether the subframe is an uplink subframe by receiving information sent by the base station for scheduling the user equipment to perform uplink data transmission on the subframe.
  • the user equipment if the user equipment is not required to perform uplink transmission on the subframe, the user equipment considers that this is a downlink subframe, and PDCCH snooping is performed on the subframe.
  • the user equipment determines whether the base station has preempted the channel on the unlicensed carrier where the LAA SCell is located by receiving the indication signaling from the base station.
  • a certain subframe is determined as a subframe for performing PDCCH monitoring
  • the certain subframe is determined as a subframe for performing PDCCH monitoring.
  • the certain subframe may be aligned or overlapped with the PDCCH subframe, or the certain subframe may not be aligned or overlapped with the PDCCH subframe.
  • the user equipment monitors the PDCCH-subframe, and for a certain subframe of the LAA SCell, if the subframe belongs to a subframe defined by one of the following cases, the user equipment is in the sub-frame.
  • PDCCH snooping is performed on the frame.
  • the subframe of the LAA Scell is aligned or overlapped with the PDCCH-subframe, but the UE does not know whether the subframe is an uplink subframe or a downlink subframe.
  • the subframe of the LAA Scell is aligned or overlapped with the PDCCH-subframe, and the UE has learned that the subframe is a downlink subframe by using indication signaling (such as Signaling A or Signaling B described below);
  • the subframe of the LAA Scell is not aligned or overlapped with the PDCCH-subframe, but the UE has known that the subframe is a downlink subframe by indicating signaling (for example, Signaling A or Signaling B described below).
  • signaling for example, Signaling A or Signaling B described below.
  • the indication information sent by the base station may include uplink and downlink configuration information of each subframe in the transmission period, or uplink and downlink configuration information of each subframe in the remaining subframes of the transmission period; where the transmission period is The maximum length of time that the base station can occupy after preempting the channel corresponding to the secondary serving cell of the unlicensed frequency band.
  • the maximum length of time that the base station can occupy the channel on the unlicensed carrier where the LAA Scell is located is called a transmission period, and the length of the transmission period is represented by N subframes (the value of N can be passed by the base station, for example.
  • RRC signaling is configured to the UE).
  • the UE may further determine, by using the indication signaling, an uplink and downlink configuration of each subframe in the transmission period, or each sub-frame remaining in the transmission period after receiving the downlink subframe of the indication signaling.
  • the uplink and downlink configuration of the frame is determined, by using the indication signaling, an uplink and downlink configuration of each subframe in the transmission period, or each sub-frame remaining in the transmission period after receiving the downlink subframe of the indication signaling.
  • FIG. 4 is a schematic diagram of an uplink and downlink configuration in a transmission period according to an embodiment of the present invention.
  • a transmission period may include 10 subframes, where a frame structure configured by a base station for a LAA Scell is DDDDDDUUUU; UE1 may be When the base station occupies the channel, the active time is obtained, so that the uplink and downlink configuration of each subframe in the transmission period is obtained.
  • the UE2 may not be in the active time when the base station occupies the channel, and is in the active time after two frames. Therefore, the uplink and downlink configuration of the remaining subframes in the transmission period is obtained.
  • the indication information sent by the base station is included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band.
  • the indication information can be referred to as Signalling A.
  • the UL/DL configuration information in the next transmission period is included in the reserved signal and sent to the UE.
  • the method further includes determining when the indication information needs to be received.
  • the user equipment does not know whether the certain subframe is an uplink subframe or a downlink subframe during the active time, but if the certain subframe is aligned or overlapped with the PDCCH subframe, the user The device decodes the reserved signal to obtain uplink and downlink configuration information.
  • the UE will decode the reserved signal including Signaling A on the subframe.
  • the indication information sent by the base station is included in downlink control information (DCI, Downlink Control Information) sent by the PDCCH.
  • DCI Downlink Control Information
  • the indication information can be referred to as Signalling B.
  • the base station may choose to send Signaling B to the UE.
  • the detailed design of the Signaling B can be as follows.
  • the downlink control information is carried by user equipment-specific (UE-specific) signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or a scheduling serving cell that is scheduled by cross-carrier scheduling Send on.
  • UE-specific user equipment-specific
  • the CRC (Cyclic Redundancy Check) of the PDCCH may be scrambled by the Cell Radio Network Temporary Identifier (C-RNTI) of the UE, or may be a newly defined
  • the RNTI eg, referred to as LAA-RNTI
  • LAA-RNTI is used to scramble the CRC of the PDCCH.
  • the downlink control information may include at least: a cell index of the secondary serving cell of the unlicensed band, a number of remaining subframes in the transmission period, and a number of downlink subframes of the remaining subframe.
  • DCI can include:
  • N'(N' ⁇ N);
  • N DL The number of downlink subframes in the remaining N' subframes in the current transmission period: N DL .
  • DCI can also include:
  • the cell may be configured by the base station when configuring the LAA SCell for the UE.
  • the cell index configuration of a certain LAA SCell of UE1 and UE2 is 1, and the cross-carrier scheduling is configured for the LAA SCell; the N configuration is 10.
  • UE1 and UE2 respectively listen to the PDCCH on the LAA Scell and receive the DCI at different times.
  • the values of the parameters in the indication signaling DCI for UE1 and UE2 are:
  • UE1 (1, 10, 6); UE2: (1, 7, 3).
  • the DCI may further include indication information indicating whether to start from the uplink or the downlink, or indication information indicating whether the uplink or the downlink is continuous, and the like.
  • the downlink control information may further include: a cell index of the secondary serving cell of the unlicensed frequency band, a number of downlink subframes of the remaining subframes in the transmission period, and an uplink subframe number of the remaining subframes.
  • DCI can include:
  • N DL The number of downlink subframes in the remaining subframes in the current transmission period: N DL ;
  • N UL The number of uplink subframes in the remaining subframes in the current transmission period: N UL .
  • DCI can also include:
  • the cell may be configured by the base station when configuring the LAA SCell for the UE.
  • the cell index configuration of a certain LAA SCell of UE1 and UE2 is 1, and the cross-carrier scheduling is configured for the LAA SCell; the N configuration is 10.
  • UE1 and UE2 respectively listen to the PDCCH on the LAA Scell and receive the DCI at different times.
  • the values of the parameters in the indication signaling DCI for UE1 and UE2 are:
  • UE1 (1, 6, 4); UE2: (1, 3, 4).
  • the DCI may further include indication information indicating whether to start from the uplink or the downlink, or an indication indicating whether the uplink or the downlink is continuous. Information and more.
  • the downlink control information may further include: a cell index of the secondary serving cell in the unlicensed frequency band, a number of remaining subframes in the transmission period, and a bitmap indicating an uplink and downlink configuration in the transmission period.
  • DCI can include:
  • N'(N' ⁇ N);
  • a bitmap of length N is used to indicate the UL/DL configuration; wherein the UE only considers the UL/DL configuration of the subframe corresponding to the rightmost N'th bitmap of the N bitmaps.
  • DCI can also include:
  • the cell may be configured by the base station to the UE when the LAA SCell is configured for the UE (only if the LAA SCell is configured for cross-carrier scheduling).
  • the cell index configuration of a certain LAA SCell of UE1 and UE2 is 1, and the cross-carrier scheduling is configured for the LAA SCell; the N configuration is 10.
  • UE1 and UE2 respectively listen to the PDCCH on the LAA Scell and receive the DCI at different times.
  • the values of the parameters in the indication signaling DCI for UE1 and UE2 are:
  • UE1 (1, 10, 1111110000); UE2: (1, 7, 1111110000).
  • the method further includes determining when the indication information needs to be received.
  • the method further includes: during the active time, the user equipment does not know whether the certain subframe is an uplink subframe or a downlink subframe. In the case that the frame is aligned or overlapped with the PDCCH subframe, the user equipment decodes the downlink control information to obtain uplink and downlink configuration information.
  • the UE will decode on the subframe for a certain subframe of the LAA Scell satisfying the condition C1. Signaling B.
  • the method further includes: if a PDCCH subframe of the scheduling serving cell, during the activation period, if the PDCCH subframe is A certain subframe of the secondary serving cell of the unlicensed frequency band is aligned or overlapped, and the user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe.
  • the user equipment decodes the downlink control information to obtain uplink and downlink configuration information.
  • the LAA SCell configures the Cross-carrier scheduling, for a scheduling service cell overlapping with the subframe of the LAA Scell satisfying the condition C1, PDCCH-subframe, if the PDCCH-subframe satisfies any of the following conditions, the UE will decode Signaling B on the PDCCH-subframe of the scheduled serving cell;
  • D1 the subframe of the scheduling serving cell before the PDCCH-subframe is not a PDCCH-subframe
  • the subframe of the scheduling serving cell before the PDCCH-subframe is a PDCCH-subframe, but not in the active time.
  • the downlink control information is carried by a cell common signaling; the PDCCH is sent on a primary serving cell of the licensed frequency band.
  • the PDCCH carrying the DCI is cell common signaling.
  • the PDCCH is transmitted on the PCell of the UE.
  • the CRC of the PDCCH can be scrambled by a newly defined RNTI (eg, called LAA-RNTI).
  • the DCI may include M information elements (including, for example, UL/DL configuration 1, UL/DL configuration 2, . . . UL/DL configuration M).
  • M may be a predefined value, or may be a parameter value configured through RRC signaling, or a value equal to the length of a current DCI.
  • Each of the information elements UL/DL configuration may be a multi-group (eg, a two-group).
  • the number of each information element UL/DL configuration corresponds to the configuration of the UL/DL indicating the LAA SCell whose index value is the same as the number.
  • the index value of the LAA SCell may be, for example, a cell index of the LAA SCell, or may be another index value configured to configure the LAA Scell. For example, if the cell index value of the LAA Scell is used and the cell index value of a certain LAA Scell is assumed to be 3, then the information element UL/DL configuration 3 is used to indicate the UL/DL configuration of the LAA SCell.
  • each information element may include at least: a number of remaining subframes in a transmission period and a number of downlink subframes of the remaining subframes.
  • each information element may include at least: a number of downlink subframes of the remaining subframes in the transmission period. And the number of uplink subframes of the remaining subframes.
  • each information element is (N DL , N UL ): where N DL is the number of downlink subframes in the remaining subframes in the current transmission period; N UL is the uplink subframe in the remaining subframes in the current transmission period. number.
  • each information element may include at least: a number of remaining subframes in the transmission period and a bitmap indicating an uplink and downlink configuration in the transmission period.
  • FIG. 5 is another example diagram of an uplink and downlink configuration in a transmission period according to an embodiment of the present invention.
  • UE1 is configured with LAA SCell 1 and LAA Scell 2;
  • UE 2 is configured with LAA Scell 2 and LAA Scell 3;
  • UE3 is configured with LAA SCell 4.
  • the value of M is 4;
  • the value of N is 10.
  • UE1 and UE2 have the same PCell.
  • UE1 and UE2 are both listening to the PDCCH of the PCell at a certain time, and receive the DCI transmitted on the PDCCH of the PCell.
  • the DCI can, for example, include the following information:
  • Example 3 ⁇ (9,1111110000);(7,1111110000);(7,1111111100);(3,1111111100) ⁇
  • the method further includes determining when the indication information needs to be received.
  • the method further includes: for a certain PDCCH subframe of the primary serving cell, during activating period, if the PDCCH subframe is aligned with a subframe of a secondary serving cell of the unlicensed band or If the user equipment does not know whether the certain subframe of the secondary serving cell of the unlicensed frequency band is an uplink subframe or a downlink subframe,
  • the user decodes the downlink control information to obtain uplink and downlink configuration information.
  • E1 the subframe of the PCell before the PDCCH-subframe is not a PDCCH-subframe
  • E2 The subframe of the PCell before this PDCCH-subframe is a PDCCH-subframe, but not in the active time.
  • the subframes of the LAA SCell that the UE also needs to monitor include:
  • sub-frame subframes 0, 1, and 5 in Raido frame 1 on the LAA Scell: a subframe that satisfies the C1 condition;
  • subframe 6 in Raido frame 1 on the LAA Scell a subframe that satisfies the C2 condition
  • subframe 7 in the Raido frame 1 on the LAA Scell that is, the subframe that satisfies the C3 condition
  • the UE needs to decode the subframe of Signaling A on the LAA SCell, including: the subframe indicated by blue on the LAA Scell.
  • the UE needs to decode the subframe of Signaling B on the LAA SCell, including:
  • PDCCH-subframe 0 in Raido frame 1 that is, a subframe that satisfies condition D2;
  • PDCCH-subframe 5 in Radio frame 1 that is, a subframe that satisfies condition D1.
  • the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.
  • An embodiment of the present invention provides a device for performing PDCCH monitoring, which is configured in a user equipment of a primary serving cell configured with at least a licensed frequency band and a secondary serving cell of an unlicensed frequency band. The same content of the embodiment of the present invention and the first embodiment will not be described again.
  • FIG. 7 is a schematic diagram of an apparatus for performing PDCCH monitoring according to an embodiment of the present invention. As shown in FIG. 7, the apparatus 700 includes:
  • the first subframe determining unit 701 the downlink subframe of the secondary serving cell of the user equipment except the unlicensed frequency band and/or other serving cells configured to be cross-carrier scheduled serving cells, and the subframe including the DwPTS in the TDD system The union of the PDCCH subframes determined as the user equipment;
  • a second subframe determining unit 702 for each subframe of the secondary serving cell of the unlicensed band,
  • the subframe is determined as a subframe for performing PDCCH monitoring; or, during activation of the user equipment During the period, if the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to perform PDCCH monitoring. a sub-frame; or, during the activation period of the user equipment, if the user equipment knows that the subframe is a downlink subframe, determining the subframe as a subframe for performing PDCCH snooping;
  • the monitoring unit 703 during the activation period of the user equipment, the PDCCH subframe determined by the first subframe determining unit 701 and the second subframe determining unit 702 determined to perform PDCCH monitoring.
  • the subframe is monitored by the PDCCH.
  • FIG. 8 is another schematic diagram of an apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus 800 includes: a first subframe determining unit 701, a second subframe determining unit 702, and a listening unit 703; as described above.
  • the apparatus 800 may further include:
  • the first receiving unit 801 receives the indication information sent by the base station.
  • the second subframe determining unit 702 is further configured to: learn, by using the indication information sent by the base station, that the subframe is a downlink subframe.
  • the other serving cell includes: a primary serving cell on the licensed frequency band, and zero Secondary serving cells on one or more licensed bands.
  • the apparatus 800 may further include:
  • the second receiving unit 802 receives information sent by the base station for scheduling the user equipment to perform uplink data transmission on the subframe.
  • the second subframe determining unit 702 is further configured to: determine whether the base station is sent by the base station to schedule the user equipment to perform uplink data transmission on the subframe, Uplink transmission is required on the subframe.
  • the indication information sent by the base station includes uplink and downlink configuration information of each subframe in a transmission period, or uplink and downlink configuration information of each subframe in the remaining subframes of the transmission period; wherein the transmission period The maximum length of time that the base station can occupy after preempting the channel corresponding to the secondary serving cell of the unlicensed band.
  • the indication information sent by the base station is included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band.
  • the apparatus 800 may further include:
  • the reserved signal is decoded to obtain uplink and downlink configuration information of the secondary serving cell of the unlicensed frequency band.
  • the indication information sent by the base station is included in downlink control information sent by using a PDCCH.
  • the downlink control information is carried by user equipment dedicated signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or in the case of cross-carrier scheduling configured in the non-authorized The scheduling service cell of the secondary serving cell of the frequency band is sent.
  • the downlink control information includes at least: a number of remaining subframes in the transmission period and a number of downlink subframes of the remaining subframes; or, a number of downlink subframes of the remaining subframes in the transmission period, and the remaining subframes The number of uplink subframes of the frame; or the number of remaining subframes in the transmission period and a bitmap indicating an uplink and downlink configuration of the remaining subframes in the transmission period.
  • the downlink control information may further include: a cell index of the secondary serving cell of the unlicensed band.
  • the PDCCH is sent on a secondary serving cell of the unlicensed frequency band
  • the apparatus 800 may further include:
  • the second decoding unit 804 during the activation period, the user equipment does not know whether the subframe is an uplink subframe or In the case of a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the downlink control information is decoded to obtain uplink and downlink configuration information.
  • the PDCCH is sent on a scheduling serving cell that is scheduled by using a cross-carrier
  • the apparatus 800 may further include:
  • the downlink control information is decoded to obtain uplink and downlink configuration information.
  • the downlink control information is carried by the cell common signaling; the PDCCH is sent on the primary serving cell of the user equipment.
  • the downlink control information includes multiple information elements; wherein the number of each information element corresponds to an index value of a secondary serving cell of an unlicensed frequency band;
  • Each information element may include at least: a number of remaining subframes in the transmission period and a number of downlink subframes of the remaining subframes; or a number of downlink subframes of the remaining subframes in the transmission period and the remaining subframes The number of uplink subframes; or the number of remaining subframes in the transmission period and a bitmap indicating uplink and downlink configurations of the remaining subframes in the transmission period.
  • the apparatus 800 may further include:
  • the user equipment decodes the downlink control information to obtain uplink and downlink configuration information.
  • An embodiment of the present invention further provides a user equipment, which is configured with the apparatus 700 or 800 as described above.
  • FIG. 9 is a schematic diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment 900 can A central processing unit 100 and a memory 140 are included; the memory 140 is coupled to the central processing unit 100.
  • the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.
  • the functionality of the apparatus 700 or 800 that performs PDCCH snooping may be integrated into the central processor 100.
  • the central processing unit 100 can be configured to perform the following control:
  • the union of the subframes is determined as the PDCCH subframe of the user equipment
  • the user equipment In a case where the user equipment is not required by the base station to perform uplink transmission on the subframe during an active time of the user equipment, determining the subframe as a subframe for performing PDCCH monitoring; or During the activation period, the user equipment does not know whether the subframe is an uplink subframe or a downlink subframe, but if the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined to be a PDCCH. a subframe to be monitored; or, in a case where the user equipment knows that the subframe is a downlink subframe during an activation period, determining the subframe as a subframe for performing PDCCH monitoring;
  • the user equipment performs monitoring of the PDCCH for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.
  • the apparatus 700 or 800 for performing PDCCH monitoring may be configured separately from the central processing unit 100.
  • the apparatus 700 or 800 may be configured as a chip connected to the central processing unit 100, and implemented by the control of the central processing unit. The function of device 700 or 800.
  • the user equipment 900 may further include: a communication module 110, an input unit 120, an audio processing unit 130, a memory 140, a camera 150, a display 160, and a power source 170.
  • the functions of the above components are similar to those of the prior art, and are not described herein again. It should be noted that the user equipment 900 does not have to include all the components shown in FIG. 9, and the above components are not required; in addition, the user equipment 900 may further include components not shown in FIG. There are technologies.
  • the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.
  • the embodiment of the invention provides a method for performing PDCCH monitoring, which is applied to a base station side.
  • the embodiment of the present invention corresponds to Embodiment 1, and the same content is not described again.
  • FIG. 10 is a schematic diagram of a method according to an embodiment of the present invention. As shown in FIG. 10, the method includes:
  • Step 1001 The base station sends the indication information to the user equipment, so that the user equipment learns that a subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe;
  • Step 1002 The base station sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.
  • step 1001 there is no order relationship between step 1001 and step 1002.
  • Step 1001 may be performed first, or step 1002 may be performed first, or may be performed simultaneously.
  • the above steps 1001 and 1002 may be performed only one of them, or may be performed. The invention is not limited thereto.
  • FIG. 10 only schematically shows information transmission between the base station and the user equipment related to the present invention, but the present invention is not limited thereto.
  • the present invention is not limited thereto.
  • the indication information may be included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band; or the indication information is included to be sent by using a PDCCH.
  • the downlink control information In the downlink control information.
  • the downlink control information may be carried by user equipment-specific signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or in the unlicensed frequency band if cross-carrier scheduling is configured. Sending on the scheduling service cell of the serving cell;
  • the downlink control information may also be carried by the cell common signaling; the PDCCH is sent on the primary serving cell of the user equipment.
  • the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.
  • the embodiment of the invention provides an apparatus for performing PDCCH monitoring, which is configured in a base station.
  • the same content of the embodiment of the present invention and the first to third embodiments will not be described again.
  • FIG. 11 is a schematic diagram of an apparatus according to an embodiment of the present invention. As shown in FIG. 11, the apparatus 1100 includes:
  • the first sending unit 1101 sends the indication information to the user equipment, so that the user equipment learns that a certain subframe of the secondary serving cell of the unlicensed frequency band is a downlink subframe; and/or
  • the second sending unit 1102 sends, to the user equipment, information for scheduling the user equipment to perform uplink data transmission on the subframe, so that the user equipment determines that uplink transmission is required to be performed on the subframe.
  • the indication information may be included in a reserved signal, where the reserved signal is used to occupy a channel corresponding to a secondary serving cell of the unlicensed frequency band; or the indication information is included to be sent by using a PDCCH.
  • the downlink control information In the downlink control information.
  • the downlink control information may be carried by user equipment-specific signaling; the PDCCH is sent on a secondary serving cell of the unlicensed frequency band, or in the unlicensed frequency band if cross-carrier scheduling is configured. Sending on the scheduling service cell of the serving cell;
  • the downlink control information may also be carried by the cell common signaling; the PDCCH is sent on the primary serving cell of the user equipment.
  • the embodiment of the invention further provides a base station, which is configured with the device 1100 as described above.
  • FIG. 12 is a schematic diagram of a structure of a base station according to an embodiment of the present invention.
  • base station 1200 can include a central processing unit (CPU) 200 and memory 210; and memory 210 is coupled to central processing unit 200.
  • the memory 210 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 200.
  • the base station 1200 can implement the method for performing PDCCH monitoring as described in Embodiment 3.
  • the central processor 200 can be configured to implement the functionality of the device 1100; that is, the central processor 200 can be configured to perform the following controls:
  • the information of the uplink data transmission on the frame is such that the user equipment determines that uplink transmission is required to be performed on the subframe.
  • the base station 1200 may further include: a transceiver 220, an antenna 230, and the like; wherein the functions of the foregoing components are similar to those of the prior art, and details are not described herein again. It should be noted that the base station 1200 does not have to include all the components shown in FIG. 12; in addition, the base station 1200 may further include not shown in FIG. For the components, refer to the prior art.
  • the PDCCH subframe of the user equipment can be accurately determined, and which subframes of the unlicensed frequency band are subframes for performing PDCCH monitoring can be determined.
  • the embodiment of the present invention further provides a communication system, and the same contents as those of Embodiments 1 to 4 are not described herein.
  • FIG. 13 is a schematic diagram of a communication system according to an embodiment of the present invention.
  • the communication system 1300 includes: a user equipment 1301, which will perform secondary service cells other than unlicensed frequency bands and/or configured to be cross-carrier scheduled.
  • the union of the downlink subframes of the other serving cells outside the serving cell, or the combination of the downlink subframe and the subframe including the DwPTS in the TDD system is determined as the PDCCH subframe of the user equipment;
  • the user equipment If the user equipment is not required by the base station to perform uplink transmission on the subframe during the activation period, determining the subframe as a subframe for performing PDCCH monitoring; or, during the activation period, the user equipment does not If the subframe is an uplink subframe or a downlink subframe, but the subframe is aligned or overlapped with the PDCCH subframe, the subframe is determined as a subframe for performing PDCCH monitoring; or In a case where the user equipment knows that the subframe is a downlink subframe during an activation period, determining the subframe as a subframe for performing PDCCH monitoring;
  • the user equipment performs monitoring of the PDCCH for the PDCCH subframe and the subframe that needs to perform PDCCH monitoring.
  • the communication system 1300 further includes:
  • the base station 1302 sends, to the user equipment 1301, information for scheduling the user equipment 1301 to perform uplink data transmission on the subframe, so that the user equipment 1301 determines that uplink transmission is required to be performed on the subframe; And/or, sending the indication information to the user equipment 1301, so that the user equipment 1301 learns that the subframe is a downlink subframe.
  • An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a user equipment, the program causes a computer to perform a method for performing PDCCH monitoring as described in Embodiment 1 in the user equipment.
  • Embodiments of the present invention provide a storage medium storing a computer readable program, wherein the computer readable The program causes the computer to perform the method of performing PDCCH monitoring as described in Embodiment 1 in the user equipment.
  • An embodiment of the present invention provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to perform a method of performing PDCCH monitoring as described in Embodiment 3 in the base station.
  • An embodiment of the present invention provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a method of performing PDCCH monitoring as described in Embodiment 3 in a base station.
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

Abstract

L'invention concerne un procédé et un dispositif pour une surveillance de PDCCH, ainsi qu'un système de communication. Le procédé consiste : à déterminer un ensemble d'union de sous-trames de liaison descendante de cellules de desserte autres que des cellules de desserte secondaires sur une bande de fréquences non autorisée et/ou une cellule de desserte configurée pour une planification inter-porteuses, ou à déterminer ledit ensemble d'union de sous-trames de liaison descendante et de sous-trames comprenant des créneaux temporels pilotes de liaison descendante dans un système TDD comme sous-trame de PDCCH d'un équipement utilisateur ; et à déterminer si chaque sous-trame des cellules de desserte secondaires sur la bande de fréquences non autorisée est ou non une sous-trame utilisée pour une surveillance de PDCCH. Par conséquent, même dans des systèmes configurés avec la bande de fréquences non autorisée, la sous-trame de PDCCH de l'équipement utilisateur peut être déterminée de manière précise ; et des sous-trames pour une surveillance de PDCCH sur la bande de fréquences non autorisée peuvent être déterminées.
PCT/CN2015/085051 2015-07-24 2015-07-24 Procédé et dispositif pour une surveillance de pdcch, et système de communication WO2017015787A1 (fr)

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CN111148129A (zh) * 2018-11-05 2020-05-12 上海朗帛通信技术有限公司 被用于无线通信的用户设备、基站中的方法和装置
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US11582773B2 (en) * 2019-07-05 2023-02-14 Qualcomm Incorporated Multiple cross-carrier scheduling component carriers (CCs)

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